How to change the quality of imported music files in SonicStage 3.2?

There are three types of importing format when using SonicStage 3.2 to import a CD - ATRAC, WAV, MP3.
.WAV files offer the highest quality, but no compression. ATRAC and MP3 files are high-compression formats.
Please choose as high bit rate as possible when using ATRAC or MP3 format as the importing format.